tests/qtest: Add a function to check whether a machine is available

It is nowadays possible to build QEMU with a reduced set of machines
in each binary. However, the qtests still hard-code the expected
machines and fail if the binary does not feature the required machine.
Let's get a little bit more flexible here: Add a function that can be
used to query whether a certain machine is available or not, and use
it in some tests as an example (more work has to be done in other
tests which will follow later).

Message-Id: <20211201104347.51922-5-thuth@redhat.com>
Acked-by: John Snow <jsnow@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/tests/qtest/prom-env-test.c b/tests/qtest/prom-env-test.c
index f41d801..bdbb01d 100644
--- a/tests/qtest/prom-env-test.c
+++ b/tests/qtest/prom-env-test.c
@@ -71,9 +71,11 @@ static void add_tests(const char *machines[])
     char *name;
 
     for (i = 0; machines[i] != NULL; i++) {
-        name = g_strdup_printf("prom-env/%s", machines[i]);
-        qtest_add_data_func(name, machines[i], test_machine);
-        g_free(name);
+        if (qtest_has_machine(machines[i])) {
+            name = g_strdup_printf("prom-env/%s", machines[i]);
+            qtest_add_data_func(name, machines[i], test_machine);
+            g_free(name);
+        }
     }
 }